Answer:
1. He believes Rainsford has outdated, old-fashioned values in a modern world.
Explanation:
This is most likely the implication of Zaroff's comparison. As Zaroff is trying to convince Rainsford to participate in a hunt with him, Rainsford makes it clear that he does not approve of this behaviour and he does not want to participate. Zaroff makes this comparison in order to imply that Rainsford's ethical concerns are outdated and old-fashioned.